[IMPROVE] Redesign Administration > Import (#17289)

.storybook/.babelrc

.storybook/config.js

app/importer/client/admin/adminImport.html

app/importer/client/admin/adminImport.js

app/importer/client/admin/adminImportNew.html

app/importer/client/admin/adminImportNew.js

app/importer/client/admin/adminImportPrepare.html

app/importer/client/admin/adminImportPrepare.js

app/importer/client/admin/adminImportProgress.html

app/importer/client/admin/adminImportProgress.js

app/importer/client/admin/importOperationSummary.js

app/importer/client/components/ImportHistoryPage.js

app/importer/client/components/ImportHistoryPage.stories.js

app/importer/client/components/ImportOperationSummary.js

...orter/client/components/ImportOperationSummary.stories.js

app/importer/client/components/ImportProgressPage.js

app/importer/client/components/ImportRoute.js

app/importer/client/components/NewImportPage.js

app/importer/client/components/NewImportPage.stories.js

app/importer/client/components/PrepareImportPage.js